S-Methylmethionine

（重定向自Vitamin U）

S-Methylmethionine (SMM) is a derivative of methionine with the chemical formula (CH₃)₂SCH₂CH₂CH(NH₃)CO₂. This cation is an intermediate in many biosynthetic pathways owing to the sulfonium functional group. The natural derivative S-methylmethionine is biosynthesized from L-methionine which is first converted to S-adenosylmethionine. The subsequent conversion, involving replacement of the adenosyl group by a methyl group is catalyzed by the enzyme methionine S-methyltransferase. S-methylmethionine is particularly abundant in plants, being more abundant than methionine.

单词	Vitamin U
释义	Vitamin U 英语百科 S-Methylmethionine （重定向自Vitamin U） S-Methylmethionine (SMM) is a derivative of methionine with the chemical formula (CH₃)₂SCH₂CH₂CH(NH₃)CO₂. This cation is an intermediate in many biosynthetic pathways owing to the sulfonium functional group. The natural derivative S-methylmethionine is biosynthesized from L-methionine which is first converted to S-adenosylmethionine. The subsequent conversion, involving replacement of the adenosyl group by a methyl group is catalyzed by the enzyme methionine S-methyltransferase. S-methylmethionine is particularly abundant in plants, being more abundant than methionine.
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